This section is from the book "The Tinman's Manual And Builder's And Mechanic's Handbook", by Isaac Ridler Butt. Also available from Amazon: The Tinman's Manual And Builder's And Mechanic's Handbook.
First draw a side elevation of the desired vessel, DE, then from A as a centre describe the arcs CDC and GEG: after finding the diam-eter of the top or large end, turn to the table of Diameters and Circumferences, where you will find the true circumference, which you will proceed to lay out on the upper or larger arc CDC, making due allowance for the locks, wire and burr. This is for one piece; if for two pieces you will lay out only one-half the circumference on the plate; if for three pieces one-third; if for four pieces one-fourth; and so on for any number, remembering to make the allowance for locks, wire and burr on the piece you use for a pattern. 3*